/**
 * Copyright 2021 Tianmian Tech. All Rights Reserved.
 * 
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * 
 *     http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.welab.wefe.board.service.service.modelexport;

import java.util.List;

/**
 * PowerShell
 *
 * @author aaron.li
 **/
public class XgboostPowerShellLanguage extends BaseXgboostLanguage {

    @Override
    protected String preBuild2ClassificationsMethodSignNameCode(int treeNum, String initScore) {
        StringBuilder preMethodCode = new StringBuilder();
        preMethodCode.append("function Score([double[]] $InputVector) {")
                .append("\n")
                .append(METHOD_BODY_PLACEHOLDER)
                .append("\n")
                .append("}");
        return preMethodCode.toString();
    }

    @Override
    protected String build2ClassificationsResultLogicCode(int treeNum, String initScore) {
        StringBuilder methodCalcCode = new StringBuilder();
        String summaryVar = "s1";
        methodCalcCode.append(indentationByNodeLayer(1, false));
        methodCalcCode.append(generateVarDef("$" + summaryVar))
                .append("\n")
                .append(indentationByNodeLayer(1, false))
                .append("$")
                .append(summaryVar)
                .append(" = 1 / (1 + [math]::Exp(0 - (")
                .append(generateTreeSum(treeNum, initScore))
                .append(")))")
                .append(lineEndSymbol())
                .append("\n")
                .append(build2ClassificationsReturnCode(summaryVar, initScore));

        return methodCalcCode.toString();
    }

    @Override
    protected String build2ClassificationsReturnCode(String varName, String initScore) {
        StringBuilder methodResultCode = new StringBuilder();
        methodResultCode.append(indentationByNodeLayer(1, false))
                .append("return @($((1) - ($" + varName + ")), $($" + varName + "))" + lineEndSymbol());

        return methodResultCode.toString();
    }


    @Override
    protected String buildExpFunction(List<String> treeVarNameList, String initScore) {
        StringBuilder code = new StringBuilder();
        code.append("[math]::Exp(0 - (")
                .append(generateTreeSum(treeVarNameList, initScore))
                .append("))");

        return code.toString();
    }

    @Override
    protected String buildMultipleClassificationsReturnCode(int classificationsNum) {
        StringBuilder code = new StringBuilder();
        code.append(resultIndentationNum(2))
                .append("return @(");
        for (int i = 0; i < classificationsNum; i++) {
            code.append("$(");
            code.append(generateResultVarName(i))
                    .append(" / (")
                    .append(generateTreeClassificationsResultSum(classificationsNum))
                    .append("))");
            if (i < classificationsNum - 1) {
                code.append(", ");
            }
        }
        code.append(")").append(lineEndSymbol());
        return code.toString();
    }


    @Override
    protected String indentationByNodeLayer(Node node, boolean initIndentation) {
        return super.indentationByNodeLayer(node, false);
    }

    @Override
    protected String indentationByNodeLayer(int layer, boolean initIndentation) {
        return super.indentationByNodeLayer(layer, false);
    }


    @Override
    protected String generateVarDef(String varName) {
        return "[double]" + varName + " = 0";
    }

    @Override
    protected String generateCompareVarName(String index) {
        return "$InputVector[" + index + "]";
    }

    @Override
    protected String greaterThanSymbol() {
        return "-gt";
    }

    @Override
    protected String lineEndSymbol() {
        return "";
    }

    @Override
    protected String generateVarName(int treeIndex) {
        return "$var" + treeIndex;
    }

    @Override
    protected String generateResultVarName(int treeIndex) {
        return "$s" + treeIndex;
    }

    @Override
    protected String resultIndentationNum(int num) {
        return super.resultIndentationNum(1);
    }
}
